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Reports unnecessary nested character classes.
<p><b>Example:</b></p>
<pre><code>
  [a-c[x-z]]
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  [a-cx-z]
</code></pre>
<!-- tooltip end -->
<p><small>New in 2020.2</small>
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